MHT CET 2023 Chemistry question

Which from following formulae is of trioxalatocobaltate (III) ion?

(A)
(B)
(C)
(D)Correct

Answer: (D)

Solution

"Trioxalato" means three oxalate ligands, (bidentate, charge each); "cobalt(III)" means the metal is Co; the suffix "-ate" means the complex ion is an anion. Net charge , so the formula is . Among the options only (d) has

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Question ID VK-098032